You are a blue turret. Shooting the red slimes, get points for every slime kill, use those points to get upgrades for your turret. PLAY EVEN MORE! :D Get all the upgrades and become the slime master or whatever you want to be called...
This was comepletely by my self. The only thing that gave me this idea was once when I was really bad at scratch I looked on a tutorial on how to move. When he came to the turning it looked something like tha turret you are playing as. And I got this idea. Hope you enjoy it :)